Personally** I would just nurse him back to sleep for now.. He's little, not comfortable, and I do believe babies go through a growth spurt at that age. I've nursed on demand for both my 7 month old & 2 year old (2 year old self weaned at 14months ish).. so that's just me. Maybe in a week or two try to comfort him in another way (picking up, rocking, patting).
By the way my our hospital and their pediatricians have always stressed not to use baby oragel. They even have a banning oragel campaign going on. Since the numbing effects can affect breathing/choking. So I'd be super careful using it, especially at night when you can's supervise a baby's breathing constantly.
Good luck with the sleep!